US1112422A - Power-transmission gearing. - Google Patents

Description

J I Aka [255151572 L.-B. GRAHAM POWER TRANSMISSION GEABING. APPLICATION FILED JULY 23,1913.

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Patented Sept. 29, 1914.

2 SHEETS-SHEET l.

L. B; GRAHAM. POWER TRANSMISSION GEARING. APPLICATION FILED JULY 23, 1913.

Patented Sept. 29, 1914.

2 SHEETS-SHBET 2.

the rotatable double Worm.

LESLIE B. GRAHAM, OF EAST CHICAGO,

INDIANA, ASSIGNOR (3F ()JflE-FL/LLF TU CLARENCE W'. TAYLOR, OF CHICAGO, ILLINGIS.

?OWELR-TBANSMISSIOI T GEABING.

Lil

Specification of Letters Patent.

Patented Slept. 29, 19145.

Application filed July 23, 1913. fieriol No. 780,675.

To (/U LIP/{02111 it "My come/1::

lie it known that, I, LasLin B. GRAHAM, a. citizen of the United States of America, residing at East Chicago, in the county. of Lake and State of .lndiana, have invented certain new and useful Improvements lll lo\ .'er-'lransmission Mechanism, of which the following is a specification.

Mr invention relates to improvements 1n power transmission mechanism, and the objectsof my improvement are, first, to provide a construction whereby to afford a positive two-wheel drive under all conditions in either direction, in motor vehicles; second, the provision of means to prevent the waste of power through'the vehicle wheel which o'l'l'er the least resistance; third, to produce compensating mechanism that Wlll permit either drive wheel to rotate faster than the other, in either direction; fourth, to construct what is termed a double worm and Worm gear wheels in positive operative engage nicn't therewith operable on the opposing ends of a divided shaft.

\lith the above and other objects in view, Ill) invention consists in the novel features and in thonovel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings forming a part of this specification, and particularly pointed out in the claims hereunto appended. I

Figure l is a longitudinal central'section of a rear aide of a motor vehicle with my invention applied thereto. Fig. 2 is a cross sei'itional View on line 2-2 of Fig. 1' with parts shown in elevation. Fig. 3 is anelevation of what termed a double Worm with parts of itslc'ngtli' broken away to disclose the'teeth of two rotatable Worm gear wheels and their positions with reference to thedonble Wei-m. Fi nd is a detail view of an anti-friction; thrust bearing for each end of Fi 5 is a cross sectional View of a modified arrangement of the Worm gear Wheels with the double Worm.

Similar numerals refer to similar parts throughout the several views. I

One embodiment of in present invention as applied to a motor ve iicle' is described as follows:

Referring to the drawings by reference numerals, 6 designates one part of a divided shaft with its squared end 7 on whichis saitably fixed a worm gear wheel 8 which. has a hub 9 with squared opening 10 therethrongh. The teeth ll are suitably formed for en gagement in mesh with a double worm hereinafter more fully described. part 1210f the divided shaft has a squared end 13 on. which is suitably tiz-red a worm gear wheel 14 with its huh 1.5 with squared opening 16 therethrongh. The teeth 17 are suitably formed for engagement in mesh with the said double worm. The Worm wheel teeth 11 and l? have relatively opposite pitch.'

l8 denotes the left part and 119 the right part of two-piece rotatable housing or member with left hub 20 and right hub 21. The two similar parts are secured together by bolts 22. The external annular flange has fixed thereto bevel gear wheel 24. by rivets 25. On the inside ofeach said part 15 and 19 are formed recesses 26 and solid por tions 53? and 28 therchetvveen.

31 is a double worm, loosely journaled on its own axis, positioned to be in mesh with both worm gear wheels, 8 and i l, to rotate in bearings 29 and 30, and is carried by the rotatable housing. The double worm has formed thereon left and right grooves or threads 32 and 38, respectively, and 15 provided withspindles 3e and rotatable in bearings 29 and 39. The grooves or threads are formed at a suitable pitch to operative-1y lI'ltQI'lQn'lC with the teeth of the two worm gear "-a'heels to move them in the direction of rotation and to permit relative rotative movement of the wheels.

In Fig. 4- an annularseries of anthfric tion balls or rollers are positioned between plates 37 and 38110 malts sensitive and responsive the double Worm when compensating; action of the worm is necessary.

In Fig. 5 is indicated a mot "fled arrangenient of worm gear wheels in respect to the double worm. On thing this change of po',

'sition adords is a more compact construction.

Tl e anti-friction element is disposed at each end of the Worm.

39 is a non-rotatable housing, and 40 13 a pinion on the engine shaft (not shown) in" mesh with the usual bevel gear Wheel which is fixed to the rotatable housing made up of parts l8 and 19.

'l'he other mesh with both worm Vv hen power is applied to the rotatable housing, the right and left thread or threads if the worm being in mesh with the teeth of both of the worm gear wheels, thahousing movcs'the worm bodily and rot-ates both worm gear wheels in either direction at the same rates of speed until the speed of one worm gear wheel is greater hen the other when. it is free to relatively rotate faster than the other worm gear wheel. In a straight forward movement of the vehicle the right and left threads of the worm in gear wheels oppose each others tendency to rotate the worm on its own axis until the speed of one vehicle wheel is relatively greater, when the over-running or running ahead of one wheel permits the worm or worms to rotate and the housing to run ahead of the slower wheel and the faster wheel to move ahead of the housing. The relatively greater speed of one "vehicle wheel is caused by the road power or the traction of such vehicle Wheel while in contact with the road surface, as, for example, when turning a corner or swerving from a straight ahead course. This action of the double worm or worms can only occur when there is difference in the speed of the two vehicle wheels.

Because of the -worm having'reversely extending or right and left hand threads cut in its surface, the action of the teeth of each worm wheel, when no power is applied by the motor the faster worm wheel by reason oi? its teeth being in mesh with the double worm will cause the worm to rotate in the same direction that the faster wheel has tendency to rotate it.

I In double chain drive, the compensating mechanism is mounted on the opposing ends of the jack shaft instead of the rear axle.

Changes, variations and modifications in the details and arrangement of my invention within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages thereof. Therefore, I do not limit my in rcntion to the exactconstruction and ar- 'rangement of the shown and described.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In power transmission mechanism of the differential type, in combination, one or more double worms, Worm wheels fixed to independent shafts, said worms each being in mesh with both of said worin wheels, and a rotatable housing carrying said double worms in a manner for bodily rotation thereof, each Worm being loosely journaled on its own axis 2..In power transmission mechanism, in

combination, independent shafts, a worm wheel fine. to one end of each shaft, one or more d worms being in mesh with both of said. worm wheels, a rotatable housing carrying the double worm or worms suitably bodily rotation thereof, each worm being loosely journalcd on its own axis, and means to rotate said housing.

3. In power transmission mechanism, in combination. one or more worms each having right and le'tt threads formed circumfercniially thereon and two worm wheels fixed to separate shat s, said worm-wheels being su itabiy it n med for intcrme hin rcngagcu'ient with each oi said worms, and to permit relative rotatiie movement of said worm Wheels, a rotatable housing suitably formed to carry each of said worms for bodily rotation there with, each worm being loosely journals-d on its own axis, and mea to rotate said housing.

'4. In power transmission mechanism, in combination, a rotatable housing formed with worm-recesses and anti-friction wormend bearinqs, one or more worms each having right and left threads formed thorcon and carried by said rotatable housing, each said worm being loosely journaled on its own axis, a divided shaft, a worm wheel fixed to one end of eachshaft each said worm being in mesh with both 0% said worm wheels, and means to rotate said housing.

5, In power. transmission mechanism, in combination, independent shafts, a worm wheel fixed 'to one end of each shaft, :1 r0- tatable housing "Formed with worm-recesses, one or more worms each having right and left threads formed thereon and rotatably carried by said rotatable housin each said worm being in mesh with both 0. said worm wheels and rotatable bodily, and means to rotate said housing.

6. In power transmission mechanism, in combination, independent shafts, a worm wheel fixed to one end of each shaft one or more worms each having right and left threads formed circumfcrentially thereon, each said worm being in mesh with both of said worm wheels, arotatable housing formed with worm-recesses and anti-friction worm-end o arings, each said worm being suitably carried by said housing for bodily rotation, each. said worm loosely journaled on its own 315;, and means to rotate the housing.

In testimony whereof I atfix my signature in presence of two witnesses.

LESLIE B. GRAHAM.

' Witnesses:

' C. Ri mann Bs'rTs,

Scorr .Lvl. HOGAN.

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